Carbureting device



Aug. 9, 1938.' G. R. EFZICSON CARBURETING DEVICE Filed June 21, 19s? 4 Sheets-Sheet 1 Y n E ,1 Nfl vE. T VP 4 n w a j 6 w Aug. 9, 1938.

CARBURETING DEVICE Filed June 21., 1937 I /v vs /v TOE geoge E. n'csbn.

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(QTT'OE/VEY a. h. smcsoN 2,125,899

4 Sheets-Sheet 2 Aug. 9, 1938.

s, R. ERICSON 2,125,899 CARBURETING DEVICE Filed June 21, 1937 4 Sheets-Sheet 3 I N 1/5 N 715E GE 3e X? Eric-son.

JYMAIW H7- TOP/VEY a. R. ERICSON 2,125,899

CARBURETING DEVICE Filed June 21, 1937 4 Sheets-Sheet 4 INVENTOE gco yc Z Er/cson.

Patented Aug. 9, 1938 UNITED STATES PATENT OFFICE 2,125,899 omnarz'rmo nnvrcr:

George B. Ericson, Kirkwood, Mo. Application June 21, 1937, Serial No. 149,480

10 Claims.

This invention relates to carbureting devices for internal combustion engines and consists in novel means for varying and controlling the quality of the fuel mixture supplied by the carburetor both as to richness and vaporization, particularly during the starting and warm up periods and when' the intake suction is subnormal.

A co-pending application, Serial No. 679,201, filed July 6th, 1933 in the name of Irven E. Coffey, L now Patent No. 2,085,351, discloses and claims automatic choke mechanism which operates similarly in some respects to the choke control mechanism herein illustrated and which attains many of the advantages thereof. Other co-pending applications, Serial No. 663,431, filed March 30th, 1933, which has matured to Patent No. 2,093,959, granted; September 21, 1937, and- Serial No.

676,087, filed June 16th, 1933, which has matured to Patent 2,093,960, granted September 21, 1937 and. Serial No. 19,842, filedMay 4th, 1935,311 in the name of the present inventor, disclose devices also similar in certain respects to the device of r the present invention, particularly with respect to the means for improving vaporization of the 35 fuel and tending to prevent the suction in the intake manifold from dropping below a predetermined minimum. Referenceis here made to the above-mentioned applications for more detailed disclosure of and claims covering certain features not fully covered herein.

An object of the present invention is to provide automatic choke mechanism and a vaporizing or flow restricting device in the intake conduit of an internal combustion engine and so interconnected that the choke valve will be positively opened a substantial amount as soon as the engine begins to run after a cold start.

Another object is to provide novel means for causing the engine to idle faster during the warm 40 up period.

' These objects and other more detailed objects hereafter appearing are attained substantially by the structure illustrated in the accompanying drawings in which: i

Fig. 1 is a sectional view of an internal combustion engine carburetor and portions of the intake andexhaust manifold thereof.

Fig. 2 is a side view of the structure in Figure l and shownpartlyin section on line 22 of Figure 1.

Fig. 3 is a partial sectional view taken substantially on line 33 of Figure 1. i

Figs. 4, 5 and 6 are diagrammatic views representing various functional parts in different op- 5 erative positions.

Fig. 7 is a horizontal section on line 1-1 of Figure 1.

The carburetor, best shown in Fig. 1, is of a well known downdraft type including air inlet horn I pivotally mounting unbalanced choke 5 valve 2 on shaft 3, and outlet portion 4 within which is pivotally supported a butterfly throttle valve 5 on shaft 6. Heat insulating structure 1 separatesthe upper and lower portions of the mixture conduit. Float bowl 8 adjacent the mix-' ture conduit receives fuel from a remote fuel tank through threaded fitting 9 and fuel is maintained in the bowl at asubstantially constant level by needle valve 10 operated by float H. Fuel is supplied to the mixture conduit through calibrated metering 'oriflce l2 and main'nozzle 13 extending through jet bar ll. An air bleed tube l5 extends downwardly through the main nozzle andcommunicates at the top with air in the mixture conduit. A crank 16 rigid withshaft 6 provides for manual operation of the throttle valve, the normal idling position being determined by engagement between stop l1 and screw 18 carried by the throttle crank. A toe I9 on the throttle crank engages stop l1 to limit the throttle valve to its 90 or wide open position.

A spacer element 20 separates the carburetor bolting flanges 2| from the riser portion 22 of intake manifold 23. Exhaust manifold 24 includes a hot spot" portion 25 for'heating the intake gases. Intake manifold 23 includes a sump or depression 26 directly beneath riser 22, which sump serves to collect or trap an accumulation of liquid gasoline, particularly, during starting of the engine when the choke valve is closed so as to apply a high suction to the main nozzle.

Carried by spacer element 20 is a thermostat housing including base portion 21 and insulated, removable cover 23. A coiled, bi-metal thermostat 23, shown in part in Fig. 3, is secured at its inner end to a 'pintle 28a projecting from cover 28 and has a hooked outer extremity 30 receiving a lateral finger 3| on pivoted segment 32, rigid with a shaft 33 extending through. spacer element 20. At the opposite end ofshaft 33 is choke valve preparatory to cold-starting of the engine. v Secured to spacer element 20 and depending downwardly through riser 22 is a sleeve '31 which,

vaporization of the mixture. Such movement of v v the po pet will also be accompanied by partial l1lidedbylpider. Bteml'isflnned closingoithechokevalveundertheinfluenceot atitsupperendtoaclevisannliwhiohisrilid thethermostatsincelinkflwillbemovedtothe witha-shaitfllpacediromshaitII-butalsoroz'lghtinslot.,stiiiwithreierencetol"ig.4.

tahiy-moimted'mspaoer element. Rigid Also'during thewarmup period, warm air end oi'shai't l2 adiacentsegmental plate drawn through the atmosphere by-pass formed arm 43 which is connected by a link 44 by suction connection 48, housing 21-18, and

II in plate ll. hot air tube 41 substantially assists in vaporizing 1o A sheet metal stove 4t mounted on exhaust liquid l accumulated n ump structure It to manifold It is connected to the thermostat houssupply additional combustible mixture to the cyling by meansoi flexible tubing 41. The interior inders for fast idling.

oi stove isopen-totheatmosphere. Also oom- As the'thermostat becomes heated. it winds v muniating with the thermostat housing is a sucupon itself and eventually permits the unbaltion connection ll which communicates with anced choke valve to be iullyopened under the 15 the intake manifold as at 4! adjacent sump g influence oi the air-stream applied directly therestructure I. .As is more fully described in the to and poppet 38. In this position of the parts, above mentioned Coley patent, the connections see Fig. 5, the end of link 44 is free to move subl'I-andfil serve for drawing ealnlut heated air stantially in either direction in slot It to permit go from stove I! through the housing 21- ior fluctuation of poppet 3| under theinfluence of and thence into the inthe varying rates of flow through the mixture conduit, movement of the poppet being constantlmall plate I pivoted to the homingbase lyresistedhyspringii. Fig.5shows the choke A I ll received byslot 52 in pivoted segvalve fully open and poppet ll drawn partially meat. soas-tobecontrolledtherehytoreupwardlytowardsitsvalveseat,asincaseoia strict suction communication It into the substantial reduction oi suction in the intake housing when the choke valve has manifold, this movement being eii'ected indeshown pendently oi the choke valve.

l'lgure 3 shows the choke and throttle valves I but substantially reduced and the poppet all fully opened, a condition iiowoihotairthrough'thethermostathousing whichprevails when theengineisiullyheated tomaintain the-thermostatinits woundupor andistraveling ataiairly high rate of speed. ated fltion' mltt ns full ni g of the In this position, the poppet constitutes a, minichohe valve without resulting in excessive heatmum restriction to the flow whereby the maxiingoithethermostatiecoih. I mumcapacityoi the carburetorisonly slightly 'ihedeviceoperatesasiollownwhentheendneisrelativelycolt sually e wamm- -'i'hemechauismsabovedescribedresultinthe tune of 70' hhrenheit, thermostat I. will be or attainment of advantages oi improved vaporim. wound mat]! to u l! le the Me, tion oi the fuel. eii'ectiveness of the choke action 40 fl h r m e p ra u m to In for starting and warm up, and simplicity, both crease thermosta i m n 999 11 the in installation and operation. The automatic choke During rlnkinz; the throttle valve is choke and vaporizing valve feature are constructpa t was; nd e eul s ed substantially in a unit which'may be readily lthmction -pplied'to hemlnm w soldandappliedasanaccessoryormaybecon- 9 on' venientlyinstalled when themaniiold and car- 5 hi h n shsinmmpn eneaththei buretor are initially assembled in the factory.

e 4 all!!! The inventlonis adapted for application to substantiallyanytypeoi manifold and carburetor tom h s h m constn ictionalthoulhpartlcuiarly-adaptedfor 5o inders. nmingcrankinanoooet fl use with downdraft Various iea- 5o eh ldll l lhflally' ll mflflm i turesoitheinventionmaybemodiiiedaswiilocmostatandalsobythennallconstantresistanee g m mn qmm mmm m i l nl'll which ul'lfl'ahait 02 intlockwise use of all such modifications as come within the wflouwlthidm llgiiresi,5md 'A seopeoi the appended claimsis contemplated.

useriesofsmallnotchesllinsleevel'laceomm 1m v V h mw lll flwm cmll- 1.Incombination.anintakeconduitioranintureconduitdurim'cnnkingandthevalveis ternalcombustionenginesaidcondmthavingan leoou'dimiynotmovedtron -itsseat. inletandanontlet,chokeandthrottlevalvesin Whmthemginenresandbeainstomthe saidoonduitilow-responsivemeansinsaidcon- Nintakemetionisincreasedmbstantialiyandthe duitbetweensaidinietandsaidoutletaspring poppetvaiveis'i'oroeddownwardiymeientlyto deviceconnectedtosaidchokevalvesoastourge withdrawthecuppedpottionthereoi'fiomsleeve thesametowardclosedp sitlonfot oldmrtlns. ll sslhowninl'lguret 'lhismovementoithe andanon-yieldingconnectionbetweensaidchoke 7.17 you; link as W uni n mg valve and said flow-responsive means under cold as tremity 0! slot to (M. 4, 5, ends) whieh, in s o dit ns oro e ns saidchokevalve turmrotatesplatellcoimierclockwisedrawing msaidilg z whentheauociated mm m m engine starts mm.

the lsti'uctureasspeeiiiedinclaimlinwhicha mmflytomtmdfflnm.- lost motion connectionisprovided between said 7ogine.nnringthewarmopperiod'.thetension fl msp sivemeans oi'springiltendgtoelooethepop tnm,m d wherehysaidchokevalvecanopenwithoutnecesbythethermostatandin'caaetheengine subsarllyafleotingsaidiiowresponsivemeans.

iectedtoanahaormalloadheioretheW' .8tructureasspecinedin'claim1inwhich stathasbeomneheampoppet will be drawnboth said choke valve and said flow-responsive to-insure proper meansareadaptedwhenclosedorpartiallyclosed to restrict flow through said intake conduit and are thermostatically controlled'so. as to be urged said flow-responsive means is adapted to restrict flow through said intake conduit and is thermally controlled so as to be urged toward its most flowrestricting position when. the temperature is low, there being an additional spring provided for constantly urging said means toward said position.

5. Structure as specified in claim 1 in which said flow responsive means is adapted to resist flow through said intake conduit and further ineluding spring means for urging said flow-responsivemeans toward its most flow-restricting position, there being a. lost motion connection between said choke valve andsaid flow-responsive means whereby the position 01 said flow-responsive means may be varied under the influence of flow in said conduit without necessarily affecting said choke valve. a 1

6. Structure as specified in claim 1 in which said flow-responsive means is provided with bypass structure whereby iuel mixture can flow through said conduit during cranking oi the associated engine without substantially aflecting said means. I y

'1. In combination, an internal combustion engine intake conduit, choke and throttle valves "therein, a valve seat in said conduit, a valve mem ber movable axially toward and from said seat, spring means ior urging said valve member toward said seat, means for closing said choke valve for cold starting, and a non-yielding connection between said valve member and said choke valve under cold starting conditions for opening said choke valve when the associated engine starts to run, said valve member being cupped and l extending within said seat so'as to insure substantial axial movement thereof under minimum flow conditions while the engine is running.

8. In combination, an internal combustion engine intake conduit incl'udingstructure tor receiv--' ing an accumulation oi liquid fuel, valve means in said conduit, a thermostat connected to said means for urging the same toward closed position when the temperature is low, a housing for i said thermostat, a stove having a connection with said housing for supplying heated gases thereto, and a suction connection between said housing and said intake conduit adjacent said structure for drawing said heated gases past said thermostat,said gases upon entering said conduit,serving to vaporize liquid fuel accumulated in said structure to supply additional combustible mixture to -the engine cylinders.

9. The combination of elements specified in claim 8 further including an element operable with said valve means for at least partially restricting said suction connection when said valve means is opened.

10. In combination, an internal combustion engine, an intake conduit having sump structure for receiving an accumulation of unvaporized fuel, a choke valve and a fuel nozzle anterior to said structure, flow responsive valve means in said conduit, a choke control device for closing said choke valve for starting, an air inlet communicating with said conduit; adjacent said sump structure for supplying extra air to vaporize iuel therein, and an element movable with said chokevalve to restrict said inlet when said choke valve is opened, said inlet when said choke valve is closed to substantially increase the mixture flowing through said conduit for last idling during the warm-up period.

, GEORGE a. nmcson.

having maximum capacity a 

